Liogenys macropelma

Systematic position. This species belongs to the order Coleoptera and the family Scarabaeidae. These beetles are significant in agricultural entomology due to their soil-dwelling larval stages, which are known to cause extensive damage to the root systems of various crops in South American agricultural landscapes.

Host crops. Liogenys macropelma is recognized as a pest affecting a wide variety of cultivated plants. It poses a particular threat to cereal crops, legumes, and pasture grasses. The larvae thrive in soils where these crops are grown, feeding voraciously on the root systems during their development stages.

Biology and life cycle. The life cycle consists of egg, larval, pupal, and adult stages. The larval stage is the most critical in terms of agricultural impact, as these grubs reside beneath the soil surface. They go through several instars, feeding on organic matter and living roots. The adults typically emerge during specific seasonal windows to mate and oviposit in the soil.

Damage and economic impact. The primary damage is caused by the larvae, which consume root systems, leading to severe nutrient uptake disruption. Plants infested by Liogenys macropelma typically show yellowing, stunting, and wilting. In high-density populations, the larvae can cause significant patches of crop failure, resulting in direct economic losses for farmers.

Protection measures. Managing this pest requires an integrated approach to reduce population density and crop exposure.

• Seed treatment with systemic insecticides.
• Tillage practices that disrupt the larval habitat in the soil.
• Crop rotation to reduce host availability.
• Monitoring of adult populations using light traps during peak activity periods.